<!--
 * @Author: 黄龙
 * @pageName: 'tree-grid  树型表格'
 * @Date: 2017-07-17 16:48:44
 * @Last Modified by:   黄龙
 * @Last Modified time: 2017-07-17 16:48:44
 * @events  @on-row-click 单击行或者单击操作按钮方法
            @on-selection-change  多选模式下 选中项变化时触发
            @on-sort-change  排序时有效，当点击排序时触发
   @props   items 显示的结构化数据
            columns 表格列的配置描述 sortable:true 开启排序功能
            type: 'selection'为多选功能 type: 'action' 为操作功能 actions:[{}] 操作按钮
 -->
<template>
  <div :style="{width:tableWidth}" class='autoTbale'>
    <table class="table table-bordered" id='hl-tree-table'>
      <thead>
      <tr>
        <th v-for="(column,index) in cloneColumns">
          <label v-if="column.type === 'selection'">
            <input type="checkbox" v-model="checks" @click="handleCheckAll">
          </label>
          <label v-else>
            {{ renderHeader(column, index) }}
            <span class="ivu-table-sort" v-if="column.sortable">
                                <Icon type="arrow-up-b" :class="{on: column._sortType === 'asc'}"
                                      @click.native="handleSort(index, 'asc')"/>
                                <Icon type="arrow-down-b" :class="{on: column._sortType === 'desc'}"
                                      @click.native="handleSort(index, 'desc')"/>
                            </span>
          </label>
        </th>
      </tr>
      </thead>
      <tbody>
      <tr v-for="(item,index) in initItems" :key="item.id" v-show="show(item)" :class="{'child-tr':item.parent}">
        <td v-for="(column,snum) in columns" :key="column.key" :style=tdStyle(column)>
          <label v-if="column.type === 'selection'">
            <input type="checkbox" :value="item.id" v-model="checkGroup"
                   @click="handleCheckClick(item,$event,index)">
          </label>
          <div v-if="column.type === 'action'">
            <i-button :type="action.type" :style="action.style" :size="action.size"
                      @click="RowClick(item,$event,index,action.name,action.text)"
                      v-for='action in (column.actions)'
                      :key="action.text">{{action.text}}
            </i-button>
          </div>
          <label @click="toggle(index,item)" v-if="!column.type">
                            <span v-if='snum==iconRow()'>
                                <i v-html='item.spaceHtml'></i>
                                <i v-if="item.children&&item.children.length>0" class="ivu-icon"
                                   :class="{'ivu-icon-plus-circled':!item.expanded,'ivu-icon-minus-circled':item.expanded }"></i>
                                <i v-else class="ms-tree-space"></i>
                            </span> {{renderBody(item, column) }}
          </label>
        </td>
      </tr>
      </tbody>
    </table>
  </div>
</template>
<script>
export default {
  name: 'treeGrid',
  props: {
    columns: Array,
    items: {
      type: Array,
      default: function () {
        return [];
      }
    }
  },
  data() {
    return {
      initItems: [], // 处理后数据数组
      cloneColumns: [], // 处理后的表头数据
      checkGroup: [], // 复选框数组
      checks: false, // 全选
      screenWidth: document.body.clientWidth, // 自适应宽
      tdsWidth: 0, // td总宽
      timer: false, // 控制监听时长
      dataLength: 0, // 树形数据长度
    }
  },
  computed: {
    tableWidth() {
      return this.tdsWidth > this.screenWidth && this.screenWidth > 0 ? this.screenWidth + 'px' : '100%'
    }
  },
  watch: {
    screenWidth(val) {
      if (!this.timer) {
        this.screenWidth = val
        this.timer = true
        setTimeout(() => {
          this.timer = false
        }, 400)
      }
    },
    items() {
      if (this.items) {
        this.dataLength = this.Length(this.items)
        this.initData(this.deepCopy(this.items), 1, null);
        this.checkGroup = this.renderCheck(this.items)
        if (this.checkGroup.length == this.dataLength) {
          this.checks = true
        } else {
          this.checks = false
        }
      }
    },
    columns: {
      handler() {
        this.cloneColumns = this.makeColumns();
      },
      deep: true
    },
    checkGroup(data) {
      this.checkAllGroupChange(data)
    },
  },
  mounted() {
    if (this.items) {
      this.dataLength = this.Length(this.items)
      this.initData(this.deepCopy(this.items), 1, null);
      this.cloneColumns = this.makeColumns();
      this.checkGroup = this.renderCheck(this.items)
      if (this.checkGroup.length == this.dataLength) {
        this.checks = true
      } else {
        this.checks = false
      }
    }
    //  绑定onresize事件 监听屏幕变化设置宽
    this.$nextTick(() => {
      this.screenWidth = document.body.clientWidth
    })
    window.onresize = () => {
      return (() => {
        window.screenWidth = document.body.clientWidth
        this.screenWidth = window.screenWidth
      })()
    }
  },
  methods: {
    //  有无多选框折叠位置优化
    iconRow() {
      for (var i = 0, len = this.columns.length; i < len; i++) {
        if (this.columns[i].type == 'selection') {
          return 1
        }
      }
      return 0
    },
    //  设置td宽度,td的align
    tdStyle(column) {
      var style = {}
      if (column.align) {
        style["text-align"] = column.align;
      }
      if (column.width) {
        style["min-width"] = column.width + 'px';
      }
      return style;
    },

    //  排序事件
    handleSort(index, type) {
      this.cloneColumns.forEach((col) => col._sortType = 'normal');
      if (this.cloneColumns[index]._sortType === type) {
        this.cloneColumns[index]._sortType = 'normal'
      } else {
        this.cloneColumns[index]._sortType = type
      }
      this.$emit('on-sort-change', this.cloneColumns[index]['key'], this.cloneColumns[index]['_sortType'])
    },
    //  点击某一行事件
    RowClick(data, event, index, name, text) {
      let result = this.makeData(data)
      this.$emit('on-row-click', result, event, index, name, text)
    },
    //  点击事件 返回数据处理
    makeData(data) {
      const t = this.type(data);
      let o;
      if (t === 'array') {
        o = [];
      } else if (t === 'object') {
        o = {};
      } else {
        return data;
      }

      if (t === 'array') {
        for (let i = 0; i < data.length; i++) {
          o.push(this.makeData(data[i]));
        }
      } else if (t === 'object') {
        for (let i in data) {
          if (i != 'spaceHtml' && i != 'parent' && i != 'level' && i != 'expanded' && i != 'isShow' && i !=
            'load') {
            o[i] = this.makeData(data[i]);
          }
        }
      }
      return o;
    },
    //  处理表头数据
    makeColumns() {
      let columns = this.deepCopy(this.columns);
      this.tdsWidth = 0
      columns.forEach((column, index) => {
        column._index = index;
        column._width = column.width ? column.width : '';
        column._sortType = 'normal';
        this.tdsWidth += column.width ? parseFloat(column.width) : 0;
      });
      return columns;
    },
    //  数据处理 增加自定义属性监听
    initData(items, level, parent) {
      this.initItems = []
      let spaceHtml = "";
      for (var i = 1; i < level; i++) {
        spaceHtml += "<i class='ms-tree-space'></i>"
      }
      items.forEach((item, index) => {
        item = Object.assign({}, item, {
          "parent": parent,
          "level": level,
          "spaceHtml": spaceHtml
        });
        if ((typeof item.expanded) == "undefined") {
          item = Object.assign({}, item, {
            "expanded": false
          });
        }
        if ((typeof item.show) == "undefined") {
          item = Object.assign({}, item, {
            "isShow": false
          });
        }
        if ((typeof item.isChecked) == "undefined") {
          item = Object.assign({}, item, {
            "isChecked": false
          });
        }
        item = Object.assign({}, item, {
          "load": (item.expanded ? true : false)
        });
        this.initItems.push(item);
        if (item.children && item.expanded) {
          this.initData(item.children, level + 1, item);
        }
      })
    },
    //   隐藏显示
    show(item) {
      return ((item.level == 1) || (item.parent && item.parent.expanded && item.isShow));
    },
    toggle(index, item) {
      let level = item.level + 1;
      let spaceHtml = "";
      for (var i = 1; i < level; i++) {
        spaceHtml += "<i class='ms-tree-space'></i>"
      }
      if (item.children) {
        if (item.expanded) {
          item.expanded = !item.expanded;
          this.close(index, item);
        } else {
          item.expanded = !item.expanded;
          if (item.load) {
            this.open(index, item);
          } else {
            item.load = true;
            item.children.forEach((child, childIndex) => {
              this.initItems.splice((index + childIndex + 1), 0, child);
              // 设置监听属性
              this.$set(this.initItems[index + childIndex + 1], 'parent', item);
              this.$set(this.initItems[index + childIndex + 1], 'level', level);
              this.$set(this.initItems[index + childIndex + 1], 'spaceHtml', spaceHtml);
              this.$set(this.initItems[index + childIndex + 1], 'isShow', true);
              this.$set(this.initItems[index + childIndex + 1], 'expanded', false);
            })
          }
        }
      }
    },
    open(index, item) {
      if (item.children) {
        item.children.forEach((child, childIndex) => {
          child.isShow = true;
          if (child.children && child.expanded) {
            this.open(index + childIndex + 1, child);
          }
        })
      }
    },
    close(index, item) {
      if (item.children) {
        item.children.forEach((child, childIndex) => {
          child.isShow = false;
          child.expanded = false;
          if (child.children) {
            this.close(index + childIndex + 1, child);
          }
        })
      }
    },
    // 点击check勾选框,判断是否有children节点 如果有就一并勾选
    handleCheckClick(data, event, index) {
      data.isChecked = !data.isChecked;
      var arr = data.children;
      if (arr) {
        if (data.isChecked) {
          this.checkGroup.push(data.id);
          for (let i = 0; i < arr.length; i++) {
            this.checkGroup.push(arr[i].id)
          }
        } else {
          for (var i = 0; i < this.checkGroup.length; i++) {
            if (this.checkGroup[i] == data.id) {
              this.checkGroup.splice(i, 1)
            }
            for (var j = 0; j < arr.length; j++) {
              if (this.checkGroup[i] == arr[j].id) {
                this.checkGroup.splice(i, 1);
              }
            }
          }
        }
      }
    },
    // checkbox 全选 选择事件
    handleCheckAll() {
      this.checks = !this.checks;
      if (this.checks) {
        this.checkGroup = this.getArray(this.checkGroup.concat(this.All(this.items)))
      } else {
        this.checkGroup = []
      }
      //  this.$emit('on-selection-change', this.checkGroup)
    },
    //  数组去重
    getArray(a) {
      var hash = {},
        len = a.length,
        result = [];
      for (var i = 0; i < len; i++) {
        if (!hash[a[i]]) {
          hash[a[i]] = true;
          result.push(a[i]);
        }
      }
      return result;
    },
    checkAllGroupChange(data) {
      if (this.dataLength > 0 && data.length === this.dataLength) {
        this.checks = true;
      } else {
        this.checks = false;
      }
      this.$emit('on-selection-change', this.checkGroup)
    },
    All(data) {
      let arr = []
      data.forEach((item) => {
        arr.push(item.id)
        if (item.children && item.children.length > 0) {
          arr = arr.concat(this.All(item.children));
        }
      })
      return arr
    },
    //  返回树形数据长度
    Length(data) {
      let length = data.length
      data.forEach((child) => {
        if (child.children) {
          length += this.Length(child.children)
        }
      })
      return length;
    },
    //  返回表头
    renderHeader(column, $index) {
      if ('renderHeader' in this.columns[$index]) {
        return this.columns[$index].renderHeader(column, $index);
      } else {
        return column.title || '#';
      }
    },

    //  返回内容
    renderBody(row, column, index) {
      return row[column.key]
    },
    //  默认选中
    renderCheck(data) {
      let arr = []
      data.forEach((item) => {
        if (item._checked) {
          arr.push(item.id)
        }
        if (item.children && item.children.length > 0) {
          arr = arr.concat(this.renderCheck(item.children));
        }
      })
      return arr
    },
    //  深度拷贝函数
    deepCopy(data) {
      var t = this.type(data),
        o, i, ni;
      if (t === 'array') {
        o = [];
      } else if (t === 'object') {
        o = {};
      } else {
        return data;
      }
      if (t === 'array') {
        for (i = 0, ni = data.length; i < ni; i++) {
          o.push(this.deepCopy(data[i]));
        }
        return o;
      } else if (t === 'object') {
        for (i in data) {
          o[i] = this.deepCopy(data[i]);
        }
        return o;
      }

    },
    type(obj) {
      var toString = Object.prototype.toString;
      var map = {
        '[object Boolean]': 'boolean',
        '[object Number]': 'number',
        '[object String]': 'string',
        '[object Function]': 'function',
        '[object Array]': 'array',
        '[object Date]': 'date',
        '[object RegExp]': 'regExp',
        '[object Undefined]': 'undefined',
        '[object Null]': 'null',
        '[object Object]': 'object'
      };
      return map[toString.call(obj)];
    }
  },
  beforeDestroy() {
    window.onresize = null
  }
}
</script>
<style>
  .autoTbale {
    overflow: auto;
  }

  table {
    width: 100%;
    border-spacing: 0;
    border-collapse: collapse;
  }

  .table-bordered {
    border: 1px solid #EBEBEB;
  }

  .table > tbody > tr > td,
  .table > tbody > tr > th,
  .table > thead > tr > td,
  .table > thead > tr > th {
    border-top: 1px solid #e7eaec;
    line-height: 1.42857;
    padding: 8px;
    vertical-align: middle;
  }

  .table-bordered > tbody > tr > td,
  .table-bordered > tbody > tr > th,
  .table-bordered > tfoot > tr > td,
  .table-bordered > tfoot > tr > th,
  .table-bordered > thead > tr > td,
  .table-bordered > thead > tr > th {
    border: 1px solid #e7e7e7;
  }

  .table > thead > tr > th {
    border-bottom: 1px solid #DDD;
  }

  .table-bordered > thead > tr > td,
  .table-bordered > thead > tr > th {
    background-color: #F5F5F6;
  }

  #hl-tree-table > tbody > tr {
    background-color: #fbfbfb;
  }

  #hl-tree-table > tbody > .child-tr {
    background-color: #fff;
  }

  .autoTbale label {
    margin: 0 8px;
  }

  .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: 14px;
    height: 14px;
  }

  .ms-tree-space::before {
    content: ""
  }

  #hl-tree-table th > label {
    margin: 0;
  }
</style>
